用反射“铸造" [英] 'casting' with reflection

问题描述

考虑以下示例代码:

class SampleClass
{
    public long SomeProperty { get; set; }
}

public void SetValue(SampleClass instance, decimal value)
{
    // value is of type decimal, but is in reality a natural number => cast
    instance.SomeProperty = (long)value;
}

现在我需要通过反射做一些类似的事情:

Now I need to do something similar through reflection:

void SetValue(PropertyInfo info, object instance, object value)
{
    // throws System.ArgumentException: Decimal can not be converted to Int64
    info.SetValue(instance, value)  
}

请注意，我不能假设 PropertyInfo 始终表示 long，该值也不总是小数.但是，我知道可以将值转换为该属性的正确类型.

Note that I cannot assume that the PropertyInfo always represents a long, neither that value is always a decimal. However, I know that value can be casted to the correct type for that property.

如何通过反射将'value'参数转换为PropertyInfo实例所代表的类型?

How can I convert the 'value' parameter to the type represented by PropertyInfo instance through reflection ?

推荐答案

void SetValue(PropertyInfo info, object instance, object value)
{
    info.SetValue(instance, Convert.ChangeType(value, info.PropertyType));
}

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